Draw hook



H, P. GROHN April 26, 1932.

DRAW HOOK Filed March 19 1926 W wm, .5%

j@ @9mm Patented Apr. 26, 1932 n iran STATES HENRY r. enorm, .on seamen, rnnnsrLvmA, `assreirortro rMc cmivnnnooKs v PATENT ,OFFICE y COMPANY, OF SCRANEON, PENNSYLVANIA, .A CORPORATION 0F PENN'SYLVAll'IAl l :DRAW H001:

Application inea vnutren 19, 1926. seriar No.A 96,090.

This invention relates to draw hooks and has for its principal object the provision of a tool that can rapidly be inserted 'between the links of an endless chain so as tor-relieve the tension on adjacent transverse lmembers so as to facilitate the withdrawal of a single link.

A further object of the invention lies in the provision of 1a draw hook particularly; suitable for use with endless cha-in grates.

With endless chains of any kind it fre-V quently happensthat 'a link must be taken out. The usual way of doing this7 in chain grates for example, is-to shut down the fire,'

'let the grate cool, with a hammer lbreak the link desired to be removed, insert in its place a new linkialmost'invariably of adilferent type, and then permanently secure 'this new -link in place, frequently by means of a driven f'fpin or a set-screw.v The .draw hook of the present invention provi-des 'a (very simple means for taking up the slack in a chain with-r out closing down the furnace at all, and

while it is for use primarily with chains in which each and =`every link is independently removable the tool lends itself readily to Ause' with other linked devices. In the particular embodiment shown each linkvof the chain Y grate is not only removablebut is replaceable 4vbut it must be remembered that the` invention must not `be limited byv therillustration except where definitely so required by the claims.

Inl the drawings Y Y Figure 1 is a front elevation of a portion of a chain grate and showing my dra-w hook in position.

Figure 2 is a sideueilevation ofthe `draw hook and a portion of the grate.A 1-

Figure 3 is .a section `taken on line 3%.-3 of Figure 2. f

Figure 4 is an elevation of the eccentric. The main drive shaft l0 of the girate carries a sprocket wheel 11 varying only/freni usual practice 1n such details as for example,v

the enlarged bays 12 and in the provision of an annular Hange 14. As shown each of the links of the chain are exactly alike having a dat top portion-16 and two slots 17 `and 18 to receive the cylindrical grate rodsZO which extend inthe usual Vfashionthe entire width of the grate. The bays 12 of the sprocket` are much widery than usual so that there will be a very' appreciable play between lthe fronty y.

of any rodfand; the rear face' of the next for; ward `adjacent teeth, so that when 4the slack is taken up there will be suliicient room in each bay to allow the lowest rod in -engagement with thef'sprocket wheel to movev upf s wardl'y and rearwardly to give a considerablegap in the chain about the sprocket vwheel as the slack in the lower reachof the' chain is taken up by the draw hook.

' The forward slot 17 of each link extends directlyk rearwardly from the rod and theny downward at lan angle of 45. The rear slot 18 extends fromthe rod forwardly anddown# wardly in 2L curve. By bringing any two ad` j jacent rods 20 together any link engagingY i both maybe removed lby lirstv lifting out the rear end ofthe link,.turning the link` about;

the forward rod Q0 as a pivot,and then, when` it is entirely free of the rear rod 20, removing it without'diiculty Vfrom the rforward i rod by niovingthe link forwardly of the rod when it will free itself by reason ofthe 45C' bevel ofthe margin of the slot 17.

The main shaft 30 of the draw hook is jour i naled in lugs 31. each integral with one of the two side pieces .32 Vof the .H shaped frame 33. The'portion of the frame between the two sides `33 may be amere spacerfbut I integral or integrally .secured to the sides or: l

' arms 32 and also the' lugs "31, so vthat it forms part of the bearing for the shaft'30.` At

leach side of the frame 33 is an eccentric35 prefer that it shall be as shown at 34', that is l y of the shaft 30 carries a crank 37 havinga socket 38 therein to receive'an elongated Shan-V i dle 40.

Each arm 3201= the frame carri-es an 'outy' wardly directed stud41 abo-ut which isfpivoted the lowerr link 43 of a toggle, the upper link 44 of which carries an-ontwardl-yeX-f tendingstud 46 on 'which' the'upper end of the lower link 43 is pivoted. Each'` link 43 is engaged by an eccentric V35V so that ',asthe n line position.

handle 40 is turned counterclockwise as in Figure 2 the toggle will be straightened, provided the pin 50 joining the two upper 'links 44 is held against movement.

the straight inner surface 54 of the bar 51V is in engagement with the at top of the grate chain link. The upper end of this deis reduced as at 60 so as to t in between longtudinally adjacent grate chainlinks and at its extreme end 61 the reduced portion is turned up and curved to engage snugly that portion of the link 15b directly beneath the forward cross bar or rod 20. At the same time the plane portion 64 of each arm of the H-shaped frame rests smoothly on the flat top 16 of the proximate link 15d of the grate.

The method of use of the draw hook is as follows: The machinery for driving the shaft 10 is disconnected temporarily but no other change in the furnace is necessary-in order to remove a link. The tool, `less the handle 40, the hook 51, and the retaining handspike 70, is placed so that each end 61 will enter in the slot between adjacent grate chain links directly over or a little forwardv of the shaft 10. 'Ihe frame 33 is now lowered 40 vso that the twoparallel flat portions 64 rest upon the next adjacent lower links 15d of the chain and with the crank 37 somewhat to the right of the position shown in Figure 2. The hook 51 is nowinserted in the appropriate slot nearly Vat the bottom of the sprocket wheel 11 andis moved until the flat portion 54 is in contact with the face of the link justl above the hook. 'Ihe pinr 50 is now slipped into the hook 55, the spike inserted'thru the alined holes in the arms 32 ofthe frame so as to retain the hook 51 in place, and the crank 37 is moved until the eccentrics 35 seat the pin 50 firmly-in place.

The handle 40 is now inserted in the socket of the crank andis movedto the left as seen in Figure 2. This straightens the toggle somewhatbut never brings it to a straight The effect ofthe straightening of the toggle is to bring the end 52 of the hook memberA 51 and the'endsO of the members 32nearertogether and-this has the e'ect offbringing the rod Y200i into registry with the rear slot 18 ofthe proximate link which isvan'y one of a row of links 15a to either side of the hook member 51 and the H member or frame v33. Y By pressing the forward, end of the link to be removed such as 15a toward the axis of the shaft 10 the rear end of the link will be freed. lVhen thus free the link 15a may be moved in the direction of normal movement of the chain, which will then free this link'from the other transverse rod 20.

lVhile holding the draw hook in the same position (it will remain in the position to which it is moved without any difficulty since the curve of the'eccentric from the point 71 y w to the point 72 is a true arc struck from the tachable member 51 is hooked as at 55 to reaxis'of the shaft 30) a new link, preferably exactly like the one taken out, may be inserted; or if the link was removed for inspection only, the link if found satisfactory can be restored to position by first hooking the forward end of the link over one rod, i. e., the forward one, and then turning it into positiony about this rod as a fulcrum and when it is in proper position with the other rod in the rear socket, releasing the draw hook,

rfurther reason for the arc 73 between the points 71 and 7 2 is to prevent the sudden snapping of the handle as might otherwise occur if the draw hook were jarred when in the slack take-up position. Since the toggle is'never Ybroughtto deadline position, movement of the crank arm 37 will always be followed by a'yielding of the toggle until the slack caused by gravity in the lower reach isrestored to-normal position.

1. In a chain tool a relatively stationary member having a chain engaging and holding portion at one end, a member slidable at right angles 4with respect to said stationary member rand having .a chainengaging and holding portion,l a ltoggle for causing the slidable member to move with respect to the stationary member tordecr'ease the distance between the two chain engaging portions andV engagingV portion at. one end, a detachable hook member slidable in the other end and at gle for causing the hook member to move with respect to the frame, retaining means for preventing the detachable hook member from moving` away from the frame and means for straightening the toggle.

3. A chain tool comprising in combination. two cooperating elongated members each having a chain engaging hook at its end, a toggle pivoted to each of said members and having its middle knuckle free, said toggle being bent at the knuckle when said hooks are in extended chain engaging position and means for engaging the middle knuckle to straighten the toggle to cause the hooks to approach each other. 1

4. In combination, a hooked member having a reces-s therein, a second hooked mem- Leanser ber slida'ble in said recess, a pair of 'links oted together and also pivoted ato the first hooked member,A a pin at the freeI end of the pair oft' links, means Von the second hooked memberto engage saidv pinto forni a'toggle Vof at one end and having a pair of parallel .arms

at the other end, a hook member silvidable in the slot between the two parallel varms and having a hook at each end, a'hand spike to retain said hook member between said arms, a pair of links pivoted to each other and one of the 'links being pivotedto: the frame, a-'pin at the free end o'tthe other-link .to engage one of said hooks, and means to straighten the toggle .to cause the pin to move the hook member with respect tothe frame.

6. In a .draw hook,.a trame adapted'to rest upon a .chain link and'to engage an adjacent chain link, a -hook member loosely mounted within .the frame and adaptedto restupon a third link and to engage the end thereof farthest from the first mentioned llink, a toggle pivotedv at one end to the frame and freely engaging the hook member at the other end and means tor straightening the vtoggle to cause the hook member tol vnieve in the dirrection lof its length.

7 In combination, two elongated members each having a chain engaging vhook at its end, a toggle pivotedto each of said-menfiv bers and havingv itsm-iddle knuckle free,

means for engaging thevmiddle knuckle -to straighten the toggle tor'cause the hooks to approach each other, and' means for engaging the middle knuckle being an eccentric pivoted to one of the elongated members,.said

eccentric having a true arc for approximately 180, said arc being struck on the radius or' the eccentric.`

8. An eccentric for operating a toggle at i its knuckle which consists of a generally circular disk mounted on a shaft to one side of the approximate center of the disk and in which an appreciable angle of the eccentric measured from its axis of turning is a true arc whereby to minimize the snapping of the toggle by a jar.

9. In a draw hook for removing a detachable link from achain, a member adapted to engage between two links of the chain.

a member slidable iii a line geiierally at right angles to the first member, said second member having a face to engage a third link of the chain and having a'hook at one end to engage said third link of the chain and means l for causing the second member to move and carry with it the third link of the chain causing said third link to move in a direction substantiallv at right angles to the 'face ofthe first link which is engaged by the first memstantiallysvertically upward in the direction ber.

greatest n In adraw hook, a frame of 'generally Heshape, ioppositely directed studs extending from 'the arms of said frame, links pivoted to said studs, a pinta pair of linkseach 'piv-k oted` to said pin, means for pivoting the our links together toform a pair of toggle knuckles and a hook carrying member slidable iin the frame between the studs and loose-y ly engaging the pin to move thereby uponl 12.'.l`he 'device of claim 10 in which' a readily detachable retaining pin 70 passes thru the ends of both arms of the frame on the same side as the studs 41 to retain the hook member 51 between the arms ofthe fran-ie, and in which the hook member has a second hook 55 to kengage *the pin 50y co-n-` -necting the links 44. y

13. A chain tool comprising in combina-- tion, a pair oi relatively slidable chainhooks,'

said hooks having chain engaging surfaces which intersect each other at an angle of substantially 900, a toggle pivoted to each of said hooks7 the pivot of one link of sai-d ktoggle being located on one hook near the :point Y oi intersection and the pivot of ythe other Flink being located on the other hook so that when i the 4toggle is straight Ait Vlies substantially parallel tothe chain engaging surface of said other hook, means for exerting force against the knuckle of the toggle whereby saidother hook is moved with respect to lsaid one hook,

a lever for operating said mean-aand .meansv tor hold-ing the chain hooks so that said righty ngle between the chain engaging surfaces of the hooks isfmaintained during the relative motionlof the hooks'. Y y

14. In combination, ftwo members each having a hook, a toggle pivoted to both inembers and an eccentric orengaging fthecen-L tral portion of the toggley to straighten it, said eccentric being a 4true arc thru an angle of mar-endian Y90 `at its greatest radius.

' 15.-`5In draw hook, a frame havingy an A elongated lflat surface to engage A,the substan-AVr tiallyfhorizontal fuel supporting top of 'a link cfa-'chain as` it passes near'the toppof tlieflsprocket wheel andhaving an "opening or bearing therein, 'a member sl'idable in said opening,` said member having an elongated fiat su'ritace to engagethe substantially verti# cad tuelsupporting top of -arsecondlink of the chain 4grate as said second link is at the side of the sprocket wheelgla hook on oneend of .the frame .and another on one 'end of` themembeig'the partof the member and the` part .of thejframe between the opening` `and the hooks forming4 the respective legs of a' right angle, means to move the member subof aline from the hook to the opening thru which it moves whereby the distance between said hooks is `varied without changing the angle between the two legs.

16. In a draw hook, a frame having an openk ended slot, a hook member slidable'in said slot, means to move the hook member in a right line direction approximately at right angles tothe length of the frame, Aand detachable Vmeans provided for restricting the movement of the hook member in its slot and in whichgthe means'for moving the hook member are carried by the frame and loosely engage the far end of the hook member.

17.A link remover comprising `a frame member and a hook member adapted to engagethe links of a chain only at the point Y wherel the chain is bentA over a sprocket in which position the fuel supporting surfaces of the links engaged are substantially at right angles toreach other, means for' preventing. movement Vbetween the frame member and its engaged link, and means carried by the frame may be removed at will for inspection ory renewal.

i 18. 4A link remover as defined in claim 17, said means for moving the hook member comprising a toggle. t

19. A. link remover as defined in claim 17, said means for moving the hook member comprising'a toggle having one link pivoted t0 said frame member and the other link pivoted on vsaid hook member, and alever pivoted to one of said chain link engaging members lfor operating the toggle.

20. A tool comprising a` bary adapted-to rest upon the fuel supporting surface of a J flink of a chainv grate as such linkapproach'es the top of the sprocket wheelof the grate, a

' lhook on the end of the bar to engage the forward end j of*V said link, a cooperating member slidably mounted with respect to said bar and having'surfaces to engage the fuel supporting top and the rear end of a link located lower upon the sprocket 'wheel than the first' mentioned link, and means for actuating said cooperating member to cause the member and the link engaged thereby to move upwardly, vmoving suchV link in the direction of movement of the sprocket wheel and therefore closer to said first link,'where by af'third -linklocated laterallyA adjacent the firstv and second links may be removed Qcrrep'laeed. 1 y v 5.5- A421.A InLatoolfor removing links from a chain grate, the combination of two bars eachk having a chain engaging hook at one end and each having a fiat link engaging surface, of means for causing one of the bars to move at right angles to the link engaging surface of the other bar.

22. In combination, a frame adapted to engage the fuel supporting surface of a link of a chain grate, a member adapted to engage the far end of a second link of said grate, and means carried by said frame to cause the member to sli de in the directionof its length whereby to cause said links to approach one another so that a third link can be removed from said grate.

V23. In a chain grate draw hook, a frame to engage the substantially horizontal top and the forward endl of a link of a chain grate, a member adapted to engage the top and the rear end of a second link, and means to cause he member and the second link to slide at right angles to the top of the first link.

124. The device of claim 20 in which the actuating means consists of a toggle and an eccentric pressing against the knuckle of the toggle, said eccentric having a surface which is a true arc thru an angle greater than at its greatest radius whereby the cooperating member will be locked in position to permit the replacement of the third link whenever the eccentric is substantially at its midposition of greatest radius, said toggle being substantially straight in such position and a movement .of 30"- to either side of mid-position causing no movement of the toggle.

In testimony whereof I aix my signature.4

- HENRY P. GROEN. 

